The term '420' originated in 1971 with a group of California high school students known as the Waldos, who used it as a code to meet for a treasure hunt involving a hidden cannabis crop. Over decades, it evolved from a local slang term into a global phenomenon, popularized by the Grateful Dead and later mainstream media. Today, 420 represents both a time of day and the date April 20th, serving as an unofficial holiday for cannabis enthusiasts. In meme culture, 420 templates often feature dramatic 'before and after' transformations, Snoop Dogg references, or psychedelic imagery to celebrate or satirize the stoner lifestyle.